public class demo1 {

    public static long count = 0;


    public static void main(String[] args) throws InterruptedException {
        Object o = new Object();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                synchronized (o){
                    count++;
                }
            }
        });

        Thread t2 = new Thread(() -> {

            for (int i = 0; i < 10000; i++) {
                synchronized (o){
                    count++;
                }
            }
        });
        t1.start();
        t2.start();

        t1.join();
        t2.join();
        System.out.println(count);

    }

/*    public static void main(String[] args) {
        Object o = new Object();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                synchronized(o){
                    count++;
                }
            }
        });

        Thread t2 = new Thread(()-> {
            for (int i = 0; i < 10000; i++) {
                synchronized (o){
                    count++;
                }
            }
        });
        t1.start();
        t2.start();


        System.out.println(count);

    }*/

}



